CN104956741A - Uplink timing control to reduce call drop - Google Patents
Uplink timing control to reduce call drop Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
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Abstract
User equipment (UE) may employ Timing Advance (TA) reporting to detect possible error conditions during communication between a base station and the UE. In some instances, the UE receives commands to change a timing advance value. The UE declares an error condition when a timing advance value compared with a reference timing advance value changes more than a threshold amount during a specified time period.
Description
The cross reference of related application
The application requires the U.S. Provisional Patent Application No.61/712 being entitled as " UPLINK TIMING CONTROL TO REDUCE CALL DROP (uplink timing for reducing calling call drop controls) " submitted to the name of the people such as KHANDEKAR on October 10th, 2012 according to 35U.S.C. § 119 (e), the rights and interests of 081, its disclosure is all clearly included in this by quoting.
Background
Field
Each side of the present disclosure relates generally to wireless communication system, and relates more specifically to perform uplink timing control to reduce calling call drop.
Background technology
Cordless communication network is widely deployed to provide the various communication services such as such as phone, video, data, information receiving, broadcast.The such network being generally multi-access network by share can Internet resources support the communication of multiple user.An example of such network is universal terrestrial radio electricity Access Network (UTRAN).UTRAN is the radio access network (RAN) of the part being defined as Universal Mobile Telecommunications System (UMTS), and UMTS is the third generation (3G) mobile phone telephony supported by third generation partnership projects (3GPP).UMTS as the succession of global system for mobile communications (GSM) technology supports various air-interface standard at present, such as Wideband Code Division Multiple Access (WCDMA) (W-CDMA), TD-CDMA Time Division-Code Division Multiple Access (TD-CDMA) and Time Division-Synchronous Code Division Multiple Access (TD-SCDMA).Such as, TD-SCDMA is just carrying out as using its existing GSM infrastructure as the bottom air interface in the UTRAN framework of core net in China.UMTS also supports to strengthen 3G data communication protocol (such as high-speed packet access (HSPA)), and it provides higher data transfer speed and capacity to the UMTS network be associated.HSPA is the merging of two kinds of mobile phone agreements and high-speed downlink packet access (HSDPA) and High Speed Uplink Packet access (HSUPA), and it is expanded and improves the performance of existing wideband protocol.
Along with the demand sustainable growth accessed mobile broadband, research and development continues to advance UMTS technology not only to meet the demand to mobile broadband access increased, and improves and strengthen the experience of user to mobile communication.
General introduction
According to an aspect of the present disclosure, a kind of method for radio communication comprises the order receiving and change timing advance value.The method also can comprise statement error condition.This error condition can at the appointed time during section timing advance value be declared with when changing and exceed threshold quantity compared with timing advance value.
According to another aspect of the present disclosure, a kind of equipment for radio communication comprises the device for receiving the order changing timing advance value.This equipment also can comprise the device for stating error condition.This error condition statement device can at the appointed time during section timing advance value state error condition with when changing and exceed threshold quantity compared with timing advance value.
According to another aspect of the present disclosure, a kind of computer program for carrying out radio communication in the wireless network comprises the computer-readable medium it recording non-transient program code.This program code comprises the program code receiving the order changing timing advance value.This program code also comprises the program code of statement error condition.This error condition can at the appointed time during section timing advance value be declared with when changing and exceed threshold quantity compared with timing advance value.
According to another aspect of the present disclosure, a kind of device for radio communication comprises memory and is coupled to (all) processors of this memory.This processor is configured to receive the order changing timing advance value.This processor is configured to state error condition further.This error condition can at the appointed time during section timing advance value be declared with when changing and exceed threshold quantity compared with timing advance value.
This more broadly sketches the contours of characteristic sum technical advantage of the present disclosure so that detailed description below can be better understood.Other feature and advantage of the present disclosure will be described below.Those skilled in the art should understand, and the disclosure easily can be used as the basis revising or be designed for other structures implementing the object identical with the disclosure.Those skilled in the art it will also be appreciated that such equivalent constructions does not depart from the instruction of the present disclosure of setting forth in claims.The novel feature being considered to characteristic of the present disclosure will be better understood when considering following description by reference to the accompanying drawings together with further object and advantage in its tissue and method of operation two.But, it is to be expressly understood that provide each width accompanying drawing all only to mediate a settlement description object for solution, and be not intended to as the definition to restriction of the present disclosure.
Accompanying drawing is sketched
Fig. 1 is the block diagram of the example explaining orally telecommunication system conceptually.Fig. 2 is the block diagram of the example of the frame structure explained orally conceptually in telecommunication system.
Fig. 3 explains orally B node and UE in telecommunication system to be in the block diagram of the example of communication conceptually.
The communication system controlling to account for the subscriber's installation resided on the cellular cell different from the cellular cell indicated by this base station is attempted in Fig. 4 explanation according to the wherein base station of aspects more of the present disclosure.
Fig. 5 explains orally to detect according to the timing advance drift of aspects more of the present disclosure the subframe time line realized.
Fig. 6 explains orally the block diagram for performing the method that uplink timing controls according to one side of the present disclosure.
Fig. 7 explains orally the diagram according to the hard-wired example of the device of the employing treatment system of an aspect of the present disclosure.
Describe in detail
Detailed description below in conjunction with accompanying drawing elaboration is intended to the description as various configuration, and is not intended to represent the only configuration can putting into practice concept described herein.This detailed description comprises detail to provide the thorough understanding to each conception of species.But, it is evident that do not have these details also can put into practice these concepts for those skilled in the art.In some instances, illustrate that well-known structure and assembly are to avoid falling into oblivion this genus in form of a block diagram.
Forward Fig. 1 to now, show the block diagram of the example explaining orally telecommunication system 100.The each conception of species provided in the whole text in the disclosure can realize across miscellaneous telecommunication system, the network architecture and communication standard.Exemplarily non-limiting, the aspects that the disclosure explains orally in FIG is that the UMTS system adopting by reference TD-SCDMA standard provides.In this example, UMTS system comprises (radio access network) RAN 102 (such as, UTRAN), it provides the various wireless services comprising phone, video, data, information receiving, broadcast and/or other services etc.RAN 102 can be divided into several radio network sub-system (RNS) (such as RNS 107), and each RNS 107 is controlled by radio network controller (RNC) (such as RNC 106).For the sake of clarity, RNC 106 and RNS 107 is only shown; But except RNC 106 and RNS 107, RAN 102 also can comprise any number RNC and RNS.RNC 106 is the devices of being especially responsible for assigning, reshuffling and discharge the radio resource in RNS 107.RNC 106 uses any suitable transmission network to interconnect to other RNC (not shown) in RAN 102 by various types of interface (such as direct physical connection, virtual network or analog).
The geographic area covered by RNS 107 can be divided into several cellular cell, and wherein radio transceiver device serves each cellular cell.Radio transceiver device is commonly called B node in UMTS application, but also can be generally referred to by those skilled in the art as base station (BS), base Transceiver Station (BTS), radio base station, wireless set, transceiver function, Basic Service Set (BSS), extended service set (ESS), access point (AP) or other certain suitable terms.For the sake of clarity, two B nodes 108 are shown; But RNS 107 can comprise any number wireless B node.B node 108 is the WAP (wireless access point) that any number mobile device is provided to core net 104.The example of mobile device comprises cell phone, smart phone, Session initiation Protocol (SIP) phone, kneetop computer, notebook, net book, intelligence basis, personal digital assistant (PDA), satelline radio, global positioning system (GPS) equipment, multimedia equipment, video equipment, digital audio-frequency player (such as, MP3 player), camera, game console or any other similar function device.Mobile device is commonly called subscriber's installation (UE) in UMTS application, but also can be generally referred to by those skilled in the art as mobile radio station (MS), subscriber station, mobile unit, subscri er unit, radio-cell, remote unit, mobile device, wireless device, Wireless Telecom Equipment, remote equipment, mobile subscriber station, access terminal (AT), mobile terminal, wireless terminal, remote terminal, hand-held set, terminal, user agent, mobile client, client or other certain suitable terms.In order to explain orally object, illustrate that three UE 110 and B node 108 are in communication.Also the down link (DL) being called as forward link refers to the communication link from B node to UE, and the up link (UL) being also called as reverse link refers to the communication link of the node from UE to B.
As shown in the figure, core net 104 comprises GSM core net.But as the skilled person will recognize, each conception of species provided in the whole text in the disclosure can realize in RAN or other suitable Access Networks, to provide the access of the core net of the other types outside to GSM network to UE.
In this example, core net 104 mobile switching centre (MSC) 112 and gateway MSC (GMSC) 114 carrys out support circuit-switched service.One or more RNC (such as, RNC 106) can be connected to MSC112.MSC 112 is the devices controlling call setup, call routing and UE mobility functions.MSC 112 also comprises Visitor Location Register (VLR) (not shown), and this VLR comprises the information relevant with subscriber during UE is in the overlay area of MSC 112.GMSC 114 provides the gateway by MSC 112, for UE place in circuit switching network 116.GMSC 114 comprises attaching position register (HLR) (not shown), and this HLR comprises subscriber data, such as reflects the data of the details of the service that specific user has subscribed to.HLR is also associated with the authentication center (AuC) comprising the verify data different because of subscriber.When receiving the calling for particular UE, GMSC 114 inquires about HLR to determine the position of this UE and this calling to be transmitted to the specific MSC serving this position.
Core net 104 also uses Serving GPRS Support Node (SGSN) 118 and Gateway GPRS Support Node (GGSN) 120 to support grouping-data, services.The GPRS representing General Packet Radio Service be designed to than standard GSM Circuit Switched Data service can the higher speed of those speed to provide packet data service.GGSN 120 provides the connection to packet-based network 122 for RAN 102.Packet-based network 122 can be internet, proprietary data net or other certain suitable packet-based network.The major function of GGSN 120 is to provide packet-based network connectivty to UE 110.Packet is transmitted between GGSN 120 and UE 110 by SGSN 118, and this SGSN 118 performs the function fundamentally identical with the function that MSC 112 performs in the circuit switched domain in packet-based territory.
UMTS air interface is spread spectrum direct sequence CDMA (DS-CDMA) system.User data expands on much wide bandwidth by being multiplied by the sequence with the pseudo-random bits being called chip by spread spectrum DS-CDMA.TD-SCDMA standard based on this type of direct sequence spread spectrum skill, and requires time division duplex (TDD) in addition, but not as FDD used in the UMTS/W-CDMA system of numerous Frequency Division Duplexing (FDD) (FDD) pattern.To the up link (UL) between B node 108 with UE 110 and down link (DL), both use identical carrier frequency to TDD, but up link and downlink transmission are divided in the different time-gap of carrier wave.
Fig. 2 shows the frame structure 200 of TD-SCDMA carrier wave.As commentary, TD-SCDMA carrier wave has the frame 202 that length is 10ms.Chip-rate in TD-SCDMA is 1.28Mcps.Frame 202 has the subframe 204 of two 5ms, and each subframe 204 comprises seven time slot TS0 to TS6.First time slot TS0 is usually allocated for downlink communication, and the second time slot TS1 is usually allocated for uplink communication.All the other time slots TS2 to TS6 maybe can be used to up link maybe can be used to down link, and this allows or is upwards having the time durations in higher data transmission time to have greater flexibility at uplink direction or at downlink side.Down link pilot timeslot (DwPTS) 206, protection period (GP) 208 and uplink pilot time slot (UpPTS) 210 (also referred to as uplink pilot channel (UpPCH)) are between TS0 and TS 1.Each time slot TS0-TS6 can allow multiplexing transfer of data on maximum 16 code channels.Transfer of data on code channel comprises by separated two data divisions of midamble 214 (its length is 144 chips) 212 (its separately length be 352 chips) and continues with the protection period (GP) 216 (its length is 16 chips).Midamble 214 can be used to the feature of such as channel estimating and so on, and the protection period 216 can be used to avoid interference between burst.Some layer 1 control informations are also in data division transmission, and it comprises synchronous displacement (SS) bit 218.Synchronous shifted bits 218 only appears in the Part II of data division.Three kinds of situations can be indicated: uploading reduction skew in transmission timing, increasing skew or not conduct immediately following the synchronous shifted bits 218 after midamble.The position of SS bit 218 does not usually use in uplink communication.
Fig. 3 is the block diagram that in RAN 300, B node 310 and UE 350 are in communication, wherein the RAN 300 B node 108 that can be RAN 102, the B node 310 in Fig. 1 can be in Fig. 1, and UE 350 can be the UE 110 in Fig. 1.In downlink communication, launch processor 320 can receive from data source 312 data and carry out the control signal of self-controller/processor 340.Launching processor 320 is that data and control signal and reference signal (such as, pilot signal) provide various signal processing function.Such as, launch processor 320 can be provided for error detection cyclic redundancy check (CRC) (CRC) code, facilitate the coding of forward error correction (FEC) and intertexture, based on various modulation scheme (such as, binary phase shift keying (BPSK), Quadrature Phase Shift Keying (QPSK), M phase shift keying (M-PSK), M quadrature amplitude modulation (M-QAM) and like this) to the mapping of signal constellation (in digital modulation), the expansion carried out with orthogonal variable spreading factor (OVSF) and produce a series of code element with being multiplied by mutually of scrambled code.Channel estimating from channel processor 344 can be used for determining coding, modulation, expansion and/or scrambling scheme for launching processor 320 by controller/processor 340.Can from the reference signal transmitted by UE 350 or from from the feedback comprised the midamble 214 (Fig. 2) of UE 350 to these channel estimating of deriving.The code element generated by transmitting processor 320 is provided to frame emission processor 330 to create frame structure.Frame emission processor 330 by code element is created this frame structure with the midamble 214 (Fig. 2) carrying out self-controller/processor 340 is multiplexing, thus obtains series of frames.These frames are provided to transmitter 332 subsequently, and this transmitter 332 provides various signal condition function, comprise these frames are amplified, filtering and being modulated on carrier wave to carry out downlink transmission on the radio medium by smart antenna 334.Smart antenna 334 available beams turns to bidirectional self-adaptive aerial array or other similar beam techniques to realize.
At UE 350 place, receiver 354 by the transmission of antenna 352 receiving downlink, and processes this transmission to recover the information be modulated on carrier wave.The information recovered by receiver 354 is provided to received frame processor 360, each frame resolved by this received frame processor 360, and midamble 214 (Fig. 2) is supplied to channel processor 394 and data, control and reference signal are supplied to receiving processor 370.Receiving processor 370 performs the inverse process of the process performed by the transmitting processor 320 in B node 310 subsequently.More specifically, receiving processor 370 descrambling these code elements of de-spread, and determine based on modulation scheme the signal constellation point that B node 310 most possibly transmits subsequently.These soft-decisions can based on the channel estimating calculated by channel processor 394.The follow-up decoded and deinterleaving of soft-decision is to recover data, control and reference signal.Subsequent check CRC code is to determine whether these frames are successfully decoded.The data of being carried by the frame of successfully decoding are follow-up will be provided to data trap 372, the application that its representative runs in UE 350 and/or various user interface (such as, display).The control signal of being carried by the frame of successfully decoding will be provided to controller/processor 390.When the received machine processor 370 of frame is successfully decoded, the repeat requests that controller/processor 390 also can use confirmation (ACK) and/or Negative Acknowledgement (NACK) agreement to support those frames.
In the uplink, the data from data source 378 are provided to transmitting processor 380 with the control signal carrying out self-controller/processor 390.Data source 378 can represent the application and various user interface (such as, keyboard) that run in UE 350.What be similar to described by the downlink transmission done in conjunction with B node 310 is functional, launch processor 380 and various signal processing function be provided, comprise CRC code, in order to facilitate the coding of FEC and intertexture, to the mapping of signal constellation (in digital modulation), the expansion carried out with OVSF and scrambling to produce a series of code element.The channel estimating that the reference signal transmitted from B node 310 by channel processor 394 or the feedback comprised from the midamble transmitted by B node 310 are derived can be used to select just suitable coding, modulation, expansion and/or scrambling scheme.The code element produced by transmitting processor 380 will be provided to frame emission processor 382 to create frame structure.Frame emission processor 382 by code element is created this frame structure with the midamble 214 (Fig. 2) carrying out self-controller/processor 390 is multiplexing, thus obtains series of frames.These frames are follow-up is provided to transmitter 356, and transmitter 356 provides various signal condition function, comprise these frames are amplified, filtering and these frames being modulated on carrier wave to carry out ul transmissions on the radio medium by antenna 352.
The mode similar with the mode described by the receiver function in conjunction with UE 350 place is sentenced to process ul transmissions at B node 310.Receiver 335 by the transmission of antenna 334 receiving uplink, and processes this transmission to recover the information be modulated on carrier wave.The information recovered by receiver 335 is provided to received frame processor 336, each frame resolved by this received frame processor 336, and midamble 214 (Fig. 2) is supplied to channel processor 344 and data, control and reference signal are supplied to receiving processor 338.Receiving processor 338 performs the inverse process of the process performed by the transmitting processor 380 in UE 350.The data of being carried by the frame of successfully decoding and control signal follow-uply can be supplied to data trap 339 and controller/processor.If receiving processor decoding some of them frame is unsuccessful, then controller/processor 340 also can use acknowledgement (ACK) and/or negate the repeat requests that acknowledgement (NACK) agreement supports to those frames.
Controller/processor 340 and 390 can be used to the operation instructing B node 310 and UE 350 place respectively.Such as, controller/processor 340 and 390 can provide various function, comprises timing, peripheral interface, voltage stabilizing, power management and other controlling functions.The computer-readable medium of memory 342 and 392 can store data for B node 310 and UE 350 and software respectively.Such as, the memory 392 of UE 350 can storage uplink timing control module 391, and UE 350 is configured for when being performed by controller/processor 390 by this uplink timing control module 391 determines based on the frequency of operation of base station and Base transceiver Station Identity Code the synchronizing channel code word expected.Scheduler/the processor 346 at B node 310 place can be used to UE Resources allocation, and is UE schedule downlink and/or ul transmissions.
Uplink timing for reducing calling call drop controls
Communication on network can based on the timing information transmitted between base station and subscriber's installation (UE).Such as, timing controlled order (such as, timing advance order) can transmit to adjust the timing advance be associated with UE between base station with UE.The transmission of timing advance instruction uplink sub-frames is relative to down-link reception timing regularly.Timing advance order can be transmitted to adjust (such as, shift to an earlier date or postpone) and be allowed network with the communication between UE by synchronous timing advance value between base station and UE.But, in some cases, repeat to receive timing advance order and carry out synchronous communication can finally cause catastrophic event or error condition to repeat adjustment timing advance value in particular directions.When error condition is lasting, error condition finally can cause calling call drop or communication distortion.Such as, network can be attempted controlling interested UE, and this UE is in the cellular cell different from the cellular cell indicated by this network.Because this UE is current is controlled, so this UE can not observe the order of automatic network by the base station in different cellular cell.As a result, the order continued on transmission direction repeats to adjust timing advance value with the interested UE of instruction by network, to try hard to synchronously and the communication of this UE.Because timing advance order is not configured for this UE, this order and/or relevant response can not be provided to network so this UE may not decode.But this UE may continue to adjust timing advance value, and this have adjusted the transmission time of communication subframe (such as, uplink sub-frames).The timing repeating to adjust communication subframe finally causes error condition.
Fig. 4 explains orally the communication system that wherein base station (such as, B node 2) is attempted controlling to account for the subscriber's installation (such as, UE A) resided on the cellular cell different from the cellular cell indicated by this base station.Base station B node 1 can be configured to service UE A, and B node 2 is configured to service UE B.Therefore, B node 2 can communicate with UE B via down link 404 and/or up link 402 (such as, transmitting communications command), and vice versa.Similarly, B node 1 can communicate with UE A via down link 412 and/or up link 410, and vice versa.
Although B node 2 is current be configured to service UE B, B node 2 can attempt also control UE A, even if UE A is just served by B node 1.This trial of B node 2 control UE A may be due to the defective network planning, and wherein B node 2 and B node 1 are configured to operate on a same frequency.Therefore, B node 2 attempts control UE A, because UE A and B node 2 operate on a same frequency.As a result, UE A may receive via down link 408 the timing advance order be intended to UE B.Because B node 2 is not configured to service UE A, so UE A can not decode be derived from the UE B order of B node 2.
Similarly, UE A may attempt communicating with B node 2 via up link 406.B node 2 may transmit synchronous displacement (SS) order (such as, timing advance order) on down link 408.Transmitted by B node 2 and may be intended to UE B's by this timing advance order that UE A receives.But UE A may attempt this timing advance order of decoding.Because this timing advance order is not intended to UE A, this timing advance order so UE A may not decode and the response relevant with this timing advance order can not be provided to network.Such as, UE A may can not send acknowledgement (ACK)/negative acknowledgement (NACK) in response to the timing advance order received from B node 2 to B node 2.As a result, B node 2 thinks that UE A fails to receive timing advance order and retransmits this timing advance order.But the timing advance order of re-transmission may be retransmitted and be retransmitted to UE A to UE B and/or on down link 408 on down link 404.Retransmitting timing advance order can repeated several times, if UE A continue to fail to B node 2 provide with this timing advance order receive the decode relevant response.As a result, UE B repeats to receive instruction UE B and adjusts timing advance value to promote these timing advance orders with the communication of B node 2.
Be configured to the UE B decoded from the timing advance order of B node 2 and adjust its timing advance value when each UE B receives the timing advance order from B node 2.Such as, UE B adjusts timing advance value to repeat to adjust the transmit timing of uplink sub-frames.But the transmit timing continuing adjustment uplink sub-frames can finally cause the signal of communication of UE B to be lost.Such as, signal of communication may drop on outside the tolerance limit/tracking time window for receiving this signal of communication (that is, at B node 1 place of control UE B) due to timing advance value lasting adjustment in one direction.That is, UE B and B node 2 can become and relative to each other lose synchronously.Repeat adjustment timing advance value and can cause error condition.Therefore, the impact preventing or at least alleviate this error condition is needed.
The timing advance drift that each side of the present disclosure comprises for detecting error condition in communication period based on timing advance report detects.When timing advance value drift goes out outside threshold value or fail to meet this threshold value, error condition can be declared.More of the present disclosure in, the drift of timing advance value can come tracked relative to nominal timing advance value.Each feature of this realization can be applied between the steady state period of communication.Such as, timing advance drift detection can be applied between the steady state period of calling, and wherein this stable state can reach at the interval sometime after this calling is established or after initiating to switch.Between this steady state period, nominal timing advance value is initialized at the expected time.This nominal timing advance value can represent a reference point, thus can follow the tracks of the drift of timing advance value according to this reference point.Such as, from this time interval (such as, 1 second=200 the subframes) place after non-serving cells is switched to target cell after calling starts or at UE, nominal timing advance value can correspond to current timing advance value.Timing advance value is tracked from the drift (this may correspond to the difference in current timing advance value and nominal timing advance value) of nominal timing advance.
When timing advance value drift exceeds threshold value, error condition is declared.In one of the present disclosure, statement error condition can be made comparisons based on by the drift of timing advance value and threshold value.This threshold value can based on the actual value of the timing advance that can run under real conditions.The actual value of timing advance can based on the clock drift of the modulator-demodulator be associated with UE and Doppler frequency.Doppler frequency can indicate UE how soon to obtain towards base station or away from base station movement.Similarly, instruction how soon can be obtained based on the drift of downlink/uplink timing advance and Doppler frequency shift or UE towards base station or away from base station movement to the selection of threshold value.
In one of the present disclosure, in some cases, timing advance drift detection can be suspended, as hung up immediately after a call set up or hanging up immediately after cellular cell upgrades/switches.During these situations, hang up timing advance drift detect the flase drop to error condition that can reduce because network causes the adjustment of UE timing during these periods.When reaching stable state, timing advance drift detection can be resumed.
In one of the present disclosure, the speed of timing advance value can compare with the speed of the actual value of timing advance, to determine whether to state error condition.At this on the one hand, the statement of the error condition speed of drifting about based on timing advance but not the absolute change of timing advance.Based on the speed of timing advance, not absolute terms states that error condition take into account error condition and because UE is towards network or the persistence command change carrying out automatic network that causes away from Network Mobility.
In one of the present disclosure, when error condition is declared, timing advance is maintained (or freezing) in current timing advance, ignores to come the lasting timing advance order for adjusting timing advance value of automatic network simultaneously.When error condition being detected, timing advance value being frozen in currency suspends in one direction to the lasting adjustment of timing advance value.As a result, calling call drop or communication degradation can be alleviated.At this on the one hand, the lasting timing advance order carrying out automatic network is left in the basket, or the timing advance value of communication is frozen, and no matter carrys out the lasting timing advance order of automatic network.
In one of the present disclosure, can based on the absolute change of uplink timing relative to initial timing advance value for stating that the timing advance drift of error condition detects, as shown in Figure 5.Although Fig. 5 describes with reference to the absolute change of timing advance value, timing advance drift detect be equally applicable to by the speed of timing advance value compared with the speed of the actual value of timing advance to determine whether to state the situation of error condition.
Fig. 5 explains orally the subframe time line 500 detected according to the timing advance drift of aspects more of the present disclosure.When reaching the stable state of calling, nominal timing advance value is initialized at the expected time.This expected time can correspond to the primary importance 502 on subframe time line 500.Primary importance 502 with in radio frame, there is System Frame Number (SFN) K
1subframe be associated.Similarly, subframe time line 500 also comprise on subframe time line 500 with System Frame Number K
2, K
3and K
4other corresponding positions 504,506 and 516.System Frame Number (SFN) represents these frames concrete frame number in time.This nominal timing advance value can represent a reference point, thus can follow the tracks of the drift of timing advance value according to this reference point.Such as, the nominal timing advance value at primary importance 502 place corresponds to current timing advance with reference to TA
1.Similarly, the nominal timing advance value at other position 504,506 and 516 places corresponds to these current timing advances with reference to TA
2, TA
3, TA
4, etc.
In one of the present disclosure, the reference time that nominal timing advance value is initialised is recorded.This reference time be may correspond in the uplink reference time.Such as, the reference time corresponding to primary importance 502 is uplink reference time T
1.Similarly, the reference time at other position 504,506 and 516 places on subframe time line 500 may correspond in uplink reference time T
2, T
3and T
4.
In realizing first, after reaching steady state, nominal timing advance value can be initialized to current timing advance value.Stable state can after calling starts 1 second or 200 subframes time reach or after the handover 1 second time reach.Such as, at primary importance 502 place, nominal timing advance value corresponds to timing advance with reference to TA
1, TA
1correspond to the current timing advance value at position 502 place after reaching stable state.
The timing advance at position 504 (it can with the position 502 on subframe time line 500 at a distance of 200 subframes or 1 second) place is drifted about, and detect can the comparing of the nominal timing advance value at position-based 502 place and the current timing advance value at position 504 place.Such as, at position 504 place, the current timing advance value TA at position 504 place
2with present nominal timing advance value (such as, TA
1) the absolute value of difference can compare with threshold value.This difference represents the timing advance drift at position 504 place.As described in, timing advance drift detect also by assessment timing advance drift speed but not absolute change come.
At current timing advance value TA
2with present nominal timing advance value (such as, TA
1) the absolute value of difference when failing to meet threshold value, the nominal timing advance value at position 504 place can be updated or be reinitialized to current timing advance value (that is, TA
2).Such as, this difference can compared with threshold value " two chips ".If this difference is not more than two chips, then the nominal timing advance value at position 504 place is reinitialized TA
2.In this example, when this difference is not more than two chips, timing advance drift detects does not state error condition.
Similarly, at current timing advance value TA
3with present nominal timing advance value (such as, TA
2) the absolute value of difference when failing to meet threshold value, the nominal timing advance value at position 506 place can be reinitialized current timing advance value (that is, TA
3).If this difference is not more than two chips, then the nominal timing advance value at position 506 (it and position 504 are at a distance of 200 subframes) place is reinitialized TA
3.When this difference is not more than two chips, timing advance drift detects does not state error condition.
At current timing advance value (such as, position 510 place) and present nominal timing advance value TA
3the absolute value of difference when being greater than threshold value (such as, 2 chips), timing advance drift detects statement error condition and also timing advance value is frozen in present nominal timing advance value TA
3.This feature may correspond in starting to receive the order of repetition timing advance at position 508 place, and its instruction UE repeats the timing adjusting up link.Such as, timing advance value can increase progressively from the time being initially received timing advance order in position 508.As described in, when the threshold value at this difference setover 510 place, timing advance drift detects statement error condition and also timing advance value is frozen in present nominal timing advance value TA
3.Present nominal timing advance value TA
3be maintained or freeze, as long as the timing advance order that network continues on transmission direction repeats to adjust timing advance value with the interested UE of instruction.Timing advance drift detection can include timing controlled ring in promote when this difference meets threshold value to freeze timing advance value.Therefore, when this difference meets threshold value, timing controlled ring can be frozen.In one aspect, between freezing period, UE transmitting power is controlled.Such as, power control command can by override to guarantee that transmitting power can not decline.Such as, HOLD (maintenance) or UP (lifting) order can be used.
When UE stops the timing advance order received on a direction at position 512 place, timing advance value is thawed at position 514 place after a while immediately.Such as, when UE receives the timing advance order relative to causing the side of error condition to go up in the opposite direction first, timing controlled ring is thawed.In one of the present disclosure, present nominal timing advance value TA
3can be used to assess further error condition.Such as, present nominal timing advance value TA
3the error condition of assess location 516 or any other in the future position can be used to.
Current timing advance value TA in distance initialization or last thawed state 1 second or 200 subframes
4(such as, at position 516 place) and present nominal timing advance value TA
3the absolute value of difference when being not more than threshold value, nominal timing advance value (such as, at position 516 place) is reinitialized current timing advance value (that is, TA
4).That is, control ring proceeds to the next position and this difference and threshold value is compared, as in previous position.
Fig. 6 shows the wireless communications method according to an aspect of the present disclosure.UE can receive the order changing timing advance value, as shown in block 602.When timing advance value during at the appointed time section with change compared with timing advance value exceed threshold quantity time, UE can state error condition, as shown in block 604.On the other hand, except relative to except the relative timing of down link, the absolute movement of uplink timing is also monitored.
Fig. 7 is the diagram of the hard-wired example explaining orally the device 700 adopting treatment system 714.Treatment system 714 can be embodied as to be had by the bus architecture that represents of bus 724 vague generalization ground.Depend on embody rule and the overall design constraints for the treatment of system 714, bus 724 can comprise interconnect bus and the bridger of any number.Various electrical chain is connected together by bus 724, comprises one or more processor and/or hardware module (being represented by processor 722, module 702 and 704 and computer-readable medium 726).Bus 724 also can link other circuit various, such as timing source, ancillary equipment, pressurizer and management circuit, and these circuit are well-known in the art, and therefore will be not described further.
This device comprises the treatment system 714 being coupled to transceiver 730.Transceiver 730 is coupled to one or more antenna 720.Transceiver 730 makes to communicate with other devices various over a transmission medium.Treatment system 714 comprises the processor 722 being coupled to computer-readable medium 726.General process is responsible for by processor 722, comprises the software performing and be stored on computer-readable medium 726.Software makes treatment system 714 perform the various functions described for any specific device when being performed by processor 722.Computer-readable medium 726 also can be used to store the data handled when executive software by processor 722.
Treatment system 714 comprises the receiver module 702 for receiving the order changing timing advance value.Treatment system 714 comprises for timing advance value during at the appointed time section and with reference to the declaration module 704 stating error condition when changing and exceed threshold quantity compared with timing advance value.This module can be the software module run in processor 722, resident/to be stored in computer-readable medium 726, is coupled to one or more hardware modules of processor 722, or above-mentioned certain every combination.Treatment system 714 can be the assembly of UE 350, and can comprise memory 392 and/or controller/processor 390.
In one configuration, a kind of equipment (such as treatment system) is configured for radio communication, comprises the device for receiving the order changing timing advance value.In one aspect, above device can be configured to perform aforementioned means the receiver module 702 of function that describes, transceiver 730, antenna 720,752, receiver 354, uplink timing control module 391, controller/processor 390, memory 392, processor 722, and/or treatment system 714.On the other hand, aforementioned means can be configured to perform the module of the function described by aforementioned means or any equipment.
In one configuration, a kind of equipment (such as treatment system) is configured for radio communication, comprises for timing advance value during at the appointed time section and with reference to the device stating error condition when changing and exceed threshold quantity compared with timing advance value.In one aspect, above device can be configured to perform the processor 722 of function, uplink timing control module 391, memory 392, controller/processor 390 and/or the treatment system 714 that are described by aforementioned means.On the other hand, aforementioned means can be configured to perform the module of the function described by aforementioned means or any equipment.
In one configuration, a kind of equipment (such as UE) is configured for radio communication, and this equipment comprises the device for stating.In one aspect, above device can be configured to perform the controller/processor 390 of function, memory 392, uplink timing control module 391, declaration module 704 and/or the treatment system 714 that are described by aforementioned means.On the other hand, aforementioned means can be configured to perform the module of the function described by aforementioned means or any equipment.
Some aspects of telecommunication system have been given with reference to TD-SCDMA system.If those skilled in the art are by comprehensible, the various aspects running through disclosure description extend to other telecommunication systems, the network architecture and communication standard.Exemplarily, various aspect extends to other UMTS system, such as W-CDMA, high-speed downlink packet access (HSDPA), High Speed Uplink Packet access (HSUPA), high-speed packet access+(HSPA+) and TD-CDMA.Various aspects also extend to and adopt Long Term Evolution (LTE) (under FDD, TDD or this two kinds of patterns), senior LTE (LTE-A) (under FDD, TDD or this two kinds of patterns), CDMA2000, evolution data optimization (EV-DO), Ultra-Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE802.20, ultra broadband (UWB), the system of bluetooth and/or other suitable systems.The telecommunication standard of the reality adopted, the network architecture and/or communication standard will depend on embody rule and be added to the overall design constraints of system.
Describe some processors in conjunction with various apparatus and method.These processors can use electronic hardware, computer software or its any combination to realize.This type of processor is embodied as hardware or software will depend on embody rule and the overall design constraints being added to system.Exemplarily, any combination available microprocessors of the processor provided in the disclosure, any part of processor or processor, microcontroller, digital signal processor (DSP), field programmable gate array (FPGA), programmable logic device (PLD), state machine, gate control logic, discrete hardware circuit and other the suitable processing components being configured to perform the various functions run through described by the disclosure realize.The functional of any combination of the processor provided in the disclosure, any part of processor or processor can realize with the software performed by microprocessor, microcontroller, DSP or other suitable platforms.
Software should be construed broadly into mean instruction, instruction set, code, code segment, program code, program, subprogram, software module, application, software application, software kit, routine, subroutine, object, can executive item, execution thread, code, function etc., no matter it is that to address with software, firmware, middleware, microcode, hardware description language or other terms be all like this.Software can be on a computer-readable medium resident.Exemplarily, computer-readable medium can comprise memory, such as magnetic storage apparatus (such as, hard disk, floppy disk, magnetic stripe), CD (such as, compact disc (CD), digital versatile dish (DVD)), smart card, flash memory device (such as, memory card, memory stick, key drive), random access memory (RAM), read-only memory (ROM), programming ROM (PROM), erasable type PROM (EPROM), electric erasable type PROM (EEPROM), register or removable dish.Although run through that the disclosure provides various in memory is shown for separating with processor, memory can at processor inside (such as, high-speed cache or register).
Computer-readable medium can be embodied in computer program.Exemplarily, computer program can comprise the computer-readable medium in encapsulating material.Those skilled in the art will recognize that how to depend on that embody rule and the overall design constraints be added on total system realize providing in the disclosure best in the whole text described functional.
Should be appreciated that, in disclosed method, the concrete order of each step or stratum are the explanations of example process.Based on design preference, should be appreciated that, can the concrete order of each step or stratum in these methods of layout again.Appended claim to a method presents the key element of various step with sample order, and and does not mean that and be defined to presented concrete order or stratum, unless there be special describing in this article.
Description before providing is to make any person skilled in the art all can put into practice various aspects described herein.The various changes of these aspects will be easily understood by those skilled, and generic principles can be applied to other aspects as defined in this article.Therefore, claim not intended to be are defined to shown each side herein, but the four corner consistent with the language of claim should be awarded, wherein to the citation of the singulative of key element and not intended to be represents " have and only have one " (except non-specifically is so stated) but " one or more ".Except non-specifically is stated in addition, otherwise term " some " refers to one or more.The phrase quoting from " at least one " in a list of items refers to and any combination of these projects comprises single member.Exemplarily, " at least one in a, b or c " is intended to contain: a; B; C; A and b; A and c; B and c; And a, b and c.The key element of the various aspects that the disclosure describes in the whole text is that equivalents in the current or known from now on all structures of those of ordinary skill in the art and functionally is clearly included in this by citation, and to be intended to contain by claim.In addition, any content disclosed herein all also not intended to be is contributed to the public, and no matter whether such disclosing is described by explicitly in detail in the claims.The regulation that any key element of claim is not all taken in 35U.S.C. § 112 sixth item is got off explanation, unless this key element be use wording " for ... device " come clearly to describe or in claim to a method situation this key element be use wording " for ... step " describe.
Claims (20)
1. a wireless communications method, comprising:
Receive the order changing timing advance value; And
When timing advance value during at the appointed time section with change compared with timing advance value exceed threshold quantity time, statement error condition.
2. the method for claim 1, is characterized in that, comprises further once state described error condition, just keeps current timing advance value.
3. the method for claim 1, is characterized in that, is included in the current command further when comprising the timing advance value with the direction different from the direction of previously received timing advance value, recovers from described error condition.
4. method as claimed in claim 3, is characterized in that, comprises further and remains described with reference to timing advance value.
5. the method for claim 1, is characterized in that, being included in further resets when not stating another mistake in the period, upgrades described with reference to timing advance value.
6. the method for claim 1, is characterized in that, comprises once state described error condition further, just keeps or improves transmitting power.
7. the method for claim 1, is characterized in that, the change of described timing advance value is measured after a certain period upon initialization.
8. method as claimed in claim 7, is characterized in that, initialization comprises switching, the initialization of newly calling out or channel resource and reshuffles.
9., for an equipment for radio communication, comprising:
For receiving the device of the order changing timing advance value; And
For timing advance value during at the appointed time section and with reference to the device stating error condition when changing and exceed threshold quantity compared with timing advance value.
10. equipment as claimed in claim 9, is characterized in that, the device recovered from described error condition when comprising further for comprising the timing advance value with the direction different from the direction of previously received timing advance value at the current command.
11. 1 kinds, for the device of radio communication, comprising:
Memory; And
At least one processor, it is coupled to described memory and is configured to:
Receive the order changing timing advance value; And
When timing advance value during at the appointed time section with change compared with timing advance value exceed threshold quantity time, statement error condition.
12. devices as claimed in claim 11, is characterized in that, at least one processor described is configured to, once state described error condition, just keep current timing advance value further.
13. devices as claimed in claim 11, it is characterized in that, at least one processor described is configured to, when the current command comprises the timing advance value with the direction different from the direction of previously received timing advance value, recover from described error condition further.
14. devices as claimed in claim 13, is characterized in that, at least one processor described is configured to remain described with reference to timing advance value further.
15. devices as claimed in claim 11, is characterized in that, at least one processor described is configured to upgrade described reference timing advance value when resetting and not stating another mistake in the period further.
16. devices as claimed in claim 11, is characterized in that, at least one processor described is configured to once state described error condition further, just keep or improve transmitting power.
17. devices as claimed in claim 11, is characterized in that, the change of described timing advance value is measured after a certain period upon initialization.
18. devices as claimed in claim 17, is characterized in that, initialization comprises switching, the initialization of newly calling out or channel resource and reshuffles.
19. 1 kinds, for the computer program of the radio communication in wireless network, comprising:
It has program recorded thereon the non-transient computer-readable medium of code, and described program code comprises:
Receive the program code of the order changing timing advance value; And
When timing advance value during at the appointed time section and with reference to the program code stating error condition when changing and exceed threshold quantity compared with timing advance value.
20. computer programs as claimed in claim 19, it is characterized in that, described program code is included in the program code recovered from described error condition when the current command comprises the timing advance value with the direction different from the direction of previously received timing advance value further.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201261712081P | 2012-10-10 | 2012-10-10 | |
| US61/712,081 | 2012-10-10 | ||
| US14/049,695 US20140098798A1 (en) | 2012-10-10 | 2013-10-09 | Uplink timing control to reduce call drop |
| US14/049,695 | 2013-10-09 | ||
| PCT/US2013/064294 WO2014059116A1 (en) | 2012-10-10 | 2013-10-10 | Uplink timing control to reduce call drop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104956741A true CN104956741A (en) | 2015-09-30 |
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| CN201380052590.6A Pending CN104956741A (en) | 2012-10-10 | 2013-10-10 | Uplink timing control to reduce call drop |
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| EP (1) | EP2907350A1 (en) |
| JP (1) | JP2015532560A (en) |
| CN (1) | CN104956741A (en) |
| WO (1) | WO2014059116A1 (en) |
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| CN108834211A (en) * | 2018-04-23 | 2018-11-16 | 中国科学院自动化研究所 | A kind of timing adjusting method and system based on 5G communication network |
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| US9319957B1 (en) * | 2013-07-31 | 2016-04-19 | Sprint Spectrum L.P. | Dynamic swapping of uplink and downlink base stations |
| US9107041B2 (en) * | 2013-08-07 | 2015-08-11 | Alcatel Lucent | Systems and methods for determining a user equipment location based on measurements from multiple base stations |
| JP6662900B2 (en) * | 2015-04-07 | 2020-03-11 | クアルコム，インコーポレイテッド | Adjusting the timing advance value on mobile devices |
| EP3409062A4 (en) * | 2016-01-27 | 2019-08-28 | Qualcomm Incorporated | Timing advance value protection in mobile devices |
| US10191621B2 (en) | 2016-04-29 | 2019-01-29 | Microsoft Technology Licensing, Llc | Exposing populated lists of personalized strings |
| CN108289325B (en) * | 2017-01-09 | 2022-03-01 | 中兴通讯股份有限公司 | Method and device for aligning uplink transmission and downlink transmission |
| EP3447936A1 (en) * | 2017-08-22 | 2019-02-27 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Wireless communication system, base-station and user-side-device |
| US10880886B2 (en) * | 2018-04-05 | 2020-12-29 | Mediatek Inc. | Determination of TA adjustment timing |
| CN110475336B (en) * | 2018-05-11 | 2022-06-28 | 华为技术有限公司 | Method and device for realizing network synchronization |
| US20210105732A1 (en) * | 2019-10-04 | 2021-04-08 | Qualcomm Incorporated | Clarification on cumulative timing advance (ta) |
| US11864142B2 (en) * | 2021-03-31 | 2024-01-02 | FG Innovation Company Limited | User equipment and method for timing alignment |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2014059116A1 (en) | 2014-04-17 |
| US20140098798A1 (en) | 2014-04-10 |
| EP2907350A1 (en) | 2015-08-19 |
| JP2015532560A (en) | 2015-11-09 |
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